The only thing that comes to my mind is that in the 9 stages of regeneration the Schwann cells have a key role, by enetering mitosis and generating the Fillipodi growth cone. Also, take notice that a neuron can only regenerate if the lesion took place in the axon and not the cell body, and since the CNS is mostly made out of cell bodies...

"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter